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Investment Securities: Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Mar. 31, 2016
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 1,786  
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 1,786  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis 16,485  
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value 16,590  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis 13,871  
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 14,108  
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis 118,158  
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 119,767  
Available-for-sale Debt Securities, Amortized Cost Basis 150,300  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 152,251  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 62  
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value 63  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount 7  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value 8  
Held to maturity, at amortized cost (estimated fair value of $71 and $76) 69 $ 75
Investments    
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 71